Simulated Blue Aquamarine 10 MM Bead Necklace 18 Inches with Silver-Plated Clasp Large 10 MM beads - approximately 300 carats of beautiful blue aquamarine. This is a heavy piece - 61 grams or over 2 ounces 18 inches long Basket weave tongue and safety clasp Aquamarine is metaphysically known as a stone of courage and fortitude that can bring great power. Said to assist with quick intellectual response, it brings inner peace, hope and self-love. Metaphysicists say it shields the aura and brings angels for their guidance and protection.